XR250 rattling top end on startup

My 98 XR250 makes a rattling sound in the top end for 1-2 seconds on startup when not used for about 4 days or more. I am currently using Motul 5100 10W40 engine oil. It is winter here in Australia, although it doesn't get too cold where I live. Do anyone think changing to a different engine oil will fix this issue? Thanks.

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